A method of extracting capacitance for a first wire segment is disclosed. The method approximates a non orthogonal first section of interconnect wiring containing the first wire segment by using an orthogonal second section of interconnect wiring. The method determines an estimated capacitance of the non orthogonal first section of interconnect wiring by using the orthogonal second section of interconnect wiring. The method adds a correction factor to the estimated capacitance to generate a modeled capacitance value for the non orthogonal first section of interconnect wiring.